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openssl refactor of digest handling

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Signed-off-by: Janos SUTO <sj@acts.hu>
This commit is contained in:
Janos SUTO 2022-09-14 20:08:59 +02:00
parent dbad46b002
commit 611260fd7e
6 changed files with 86 additions and 60 deletions
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3
src/defs.h
View File

@ -41,7 +41,8 @@
#define BASE64_RATIO 1.33333333
#define DIGEST_LENGTH SHA256_DIGEST_LENGTH
#define DIGEST_LENGTH EVP_MAX_MD_SIZE
#define DIGEST_HEX_LENGTH 2*DIGEST_LENGTH+1
#define UNDEF 0
#define READY 1

119
src/digest.c
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@ -34,16 +34,30 @@ int search_header_end(char *p, int n){
int make_digests(struct session_data *sdata, struct config *cfg){
int i=0, n, fd, offset=3, hdr_len=0;
int n, fd, offset=3, hdr_len=0;
char *body=NULL;
unsigned char buf[BIGBUFSIZE], md[DIGEST_LENGTH], md2[DIGEST_LENGTH];
SHA256_CTX context, context2;
unsigned char buf[BIGBUFSIZE];
EVP_MD_CTX *ctx, *ctx2;
const EVP_MD *md, *md2;
unsigned int i=0, md_len, md_len2;
unsigned char md_value[EVP_MAX_MD_SIZE], md_value2[EVP_MAX_MD_SIZE];
memset(sdata->bodydigest, 0, 2*DIGEST_LENGTH+1);
memset(sdata->digest, 0, 2*DIGEST_LENGTH+1);
SHA256_Init(&context);
SHA256_Init(&context2);
md = EVP_get_digestbyname("sha256");
md2 = EVP_get_digestbyname("sha256");
if(md == NULL || md2 == NULL){
syslog(LOG_PRIORITY, "ERROR: unknown message digest: sha256 in %s:%d", __func__, __LINE__);
return 1;
}
ctx = EVP_MD_CTX_new();
EVP_DigestInit_ex(ctx, md, NULL);
ctx2 = EVP_MD_CTX_new();
EVP_DigestInit_ex(ctx2, md2, NULL);
fd = open(sdata->filename, O_RDONLY);
if(fd == -1) return -1;
@ -51,7 +65,7 @@ int make_digests(struct session_data *sdata, struct config *cfg){
memset(buf, 0, sizeof(buf));
while((n = read(fd, buf, sizeof(buf))) > 0){
SHA256_Update(&context2, buf, n);
EVP_DigestUpdate(ctx2, buf, n);
body = (char *)&buf[0];
@ -68,7 +82,7 @@ int make_digests(struct session_data *sdata, struct config *cfg){
}
SHA256_Update(&context, body, n);
EVP_DigestUpdate(ctx, body, n);
i++;
}
@ -77,82 +91,93 @@ int make_digests(struct session_data *sdata, struct config *cfg){
sdata->hdr_len = hdr_len;
SHA256_Final(md, &context);
SHA256_Final(md2, &context2);
EVP_DigestFinal_ex(ctx, md_value, &md_len);
EVP_MD_CTX_free(ctx);
EVP_DigestFinal_ex(ctx2, md_value2, &md_len2);
EVP_MD_CTX_free(ctx2);
for(i=0;i<DIGEST_LENGTH;i++){
snprintf(sdata->bodydigest + i*2, 3, "%02x", md[i]);
snprintf(sdata->digest + i*2, 3, "%02x", md2[i]);
for(i=0;i<md_len;i++){
snprintf(sdata->bodydigest + i*2, 3, "%02x", md_value[i]);
}
for(i=0;i<md_len2;i++){
snprintf(sdata->digest + i*2, 3, "%02x", md_value2[i]);
}
return 0;
}
void digest_file(char *filename, char *digest){
int fd, i, n;
unsigned char buf[MAXBUFSIZE], md[DIGEST_LENGTH];
SHA256_CTX context;
void raw_digest_file(char *digestname, char *filename, unsigned char *md_value){
int fd, n;
unsigned char buf[MAXBUFSIZE];
EVP_MD_CTX *ctx;
const EVP_MD *md;
unsigned int md_len;
memset(digest, 0, 2*DIGEST_LENGTH+1);
md = EVP_get_digestbyname(digestname);
if(md == NULL){
syslog(LOG_PRIORITY, "ERROR: unknown message digest: '%s' in %s:%d", digestname, __func__, __LINE__);
return;
}
fd = open(filename, O_RDONLY);
if(fd == -1) return;
SHA256_Init(&context);
ctx = EVP_MD_CTX_new();
EVP_DigestInit_ex(ctx, md, NULL);
while((n = read(fd, buf, sizeof(buf))) > 0){
SHA256_Update(&context, buf, n);
EVP_DigestUpdate(ctx, buf, n);
}
close(fd);
SHA256_Final(md, &context);
for(i=0;i<DIGEST_LENGTH;i++)
snprintf(digest + i*2, 2*DIGEST_LENGTH, "%02x", md[i]);
EVP_DigestFinal_ex(ctx, md_value, &md_len);
EVP_MD_CTX_free(ctx);
}
void digest_string(char *s, char *digest){
int i;
void digest_file(char *filename, char *digest){
unsigned char md[DIGEST_LENGTH];
SHA256_CTX context;
raw_digest_file("sha256", filename, &md[0]);
memset(digest, 0, 2*DIGEST_LENGTH+1);
SHA256_Init(&context);
SHA256_Update(&context, s, strlen(s));
SHA256_Final(md, &context);
for(i=0;i<DIGEST_LENGTH;i++)
for(int i=0;i<SHA256_DIGEST_LENGTH;i++){
snprintf(digest + i*2, 2*DIGEST_LENGTH, "%02x", md[i]);
}
}
void md5_string(char *s, char *digest){
int i;
unsigned char md[MD5_DIGEST_LENGTH];
MD5_CTX context;
void digest_string(char *digestname, char *s, char *digest){
EVP_MD_CTX *ctx;
const EVP_MD *md;
unsigned int i, md_len;
unsigned char md_value[DIGEST_LENGTH];
memset(digest, 0, 2*MD5_DIGEST_LENGTH+2);
memset(digest, 0, 2*DIGEST_LENGTH+2);
MD5_Init(&context);
md = EVP_get_digestbyname(digestname);
if(md == NULL){
syslog(LOG_PRIORITY, "ERROR: unknown message digest: '%s' in %s:%d", digestname, __func__, __LINE__);
return;
}
MD5_Update(&context, s, strlen(s));
ctx = EVP_MD_CTX_new();
EVP_DigestInit_ex(ctx, md, NULL);
EVP_DigestUpdate(ctx, s, strlen(s));
EVP_DigestFinal_ex(ctx, md_value, &md_len);
EVP_MD_CTX_free(ctx);
MD5_Final(md, &context);
for(i=0;i<MD5_DIGEST_LENGTH;i++)
snprintf(digest + i*2, 2*MD5_DIGEST_LENGTH, "%02x", md[i]);
for(i=0;i<md_len;i++){
snprintf(digest + i*2, 2*DIGEST_LENGTH, "%02x", md_value[i]);
}
}
void create_md5_from_email_address(char *puf, char *md5buf){
md5_string(puf, md5buf);
digest_string("md5", puf, md5buf);
md5buf[2*MD5_DIGEST_LENGTH] = ' ';
}

6
src/message.c
View File

@ -206,11 +206,11 @@ int store_meta_data(struct session_data *sdata, struct parser_state *state, stru
snprintf(s, sizeof(s)-1, "%llu+%s%s%s%ld%ld%ld%d%d%d%d%s%s%s", id, subj, sender, state->message_id, sdata->now, sdata->sent, sdata->retained, sdata->tot_len, sdata->hdr_len, sdata->direction, state->n_attachments, sdata->ttmpfile, sdata->digest, sdata->bodydigest);
digest_string(s, &vcode[0]);
digest_string("sha256", s, &vcode[0]);
memset(ref, 0, sizeof(ref));
if(strlen(state->reference) > 10){
digest_string(state->reference, &ref[0]);
digest_string("sha256", state->reference, &ref[0]);
update_metadata_reference(sdata, state, &ref[0], cfg);
}
else if(state->reference[0] == 0){
@ -218,7 +218,7 @@ int store_meta_data(struct session_data *sdata, struct parser_state *state, stru
// check if this is a message which is already referenced
uint64 count=0;
digest_string(state->message_id, &ref[0]);
digest_string("sha256", state->message_id, &ref[0]);
if(prepare_sql_statement(sdata, &sql, SQL_PREPARED_STMT_GET_METADATA_REFERENCE) != ERR){
p_bind_init(&sql);

2
src/parser.c
View File

@ -169,7 +169,7 @@ void post_parse(struct session_data *sdata, struct parser_state *state, struct c
}
digest_string(state->message_id, &(state->message_id_hash[0]));
digest_string("sha256", state->message_id, &(state->message_id_hash[0]));
if(sdata->sent == 0) sdata->sent = sdata->now;
}

2
src/piler.h
View File

@ -37,7 +37,7 @@ int do_av_check(char *filename, struct config *cfg);
int make_digests(struct session_data *sdata, struct config *cfg);
void digest_file(char *filename, char *digest);
void digest_string(char *s, char *digest);
void digest_string(char *digestname, char *s, char *digest);
void create_md5_from_email_address(char *puf, char *md5buf);
void remove_stripped_attachments(struct parser_state *state);

2
unit_tests/check_digest.c
View File

@ -29,7 +29,7 @@ static void test_digest_string(){
};
for(i=0; i<sizeof(tests)/sizeof(struct digest_test); i++){
digest_string(tests[i].s, &digest[0]);
digest_string("sha256", tests[i].s, &digest[0]);
assert(strcmp(digest, tests[i].digest1) == 0 && "test_digest_string()");
}